CN116841010B - Optical lens - Google Patents
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- CN116841010B CN116841010B CN202311123994.1A CN202311123994A CN116841010B CN 116841010 B CN116841010 B CN 116841010B CN 202311123994 A CN202311123994 A CN 202311123994A CN 116841010 B CN116841010 B CN 116841010B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; a second lens with negative focal power, the object side of which is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface at a paraxial region; a sixth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; wherein, contain at least one plastic lens and a glass lens in the optical lens. The invention has the advantages of small distortion, ultra-wide angle, small volume and high pixel by reasonably arranging the surface type and the focal power of the six glass-plastic hybrid lenses.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
The panoramic technology is a novel visual technology which is developed rapidly at present, and the panoramic imaging device is utilized to splice and synthesize images shot by one or a plurality of wide-angle lenses, so that a panoramic image of 360 degrees in the horizontal direction can be obtained. The wide-angle lens has the characteristic of wide viewing angle, can shoot pictures with strong visual impact in a large range, and can shoot more picture contents, so that the wide-angle lens can meet the scenes with special requirements on imaging range, and can be applied to moving cameras, unmanned aerial vehicles, vehicle-mounted images, conference video equipment and the like. In order to obtain a clearer imaging picture and a wider viewing angle, the imaging quality requirement on the wide-angle lens is also higher and higher.
The wide-angle lens has wide application scene and is used in complex environments such as severe vibration, high pressure, high temperature and low temperature, so the performance requirement on the matched wide-angle lens is high, the wide-angle lens is required to have good thermal stability to cope with changeable use environments such as high temperature and low temperature, the wide-angle lens is required to have smaller volume and weight, and meanwhile, the wide-angle lens can be matched with a chip with higher pixels to shoot clear and vivid pictures under different use scenes. The distortion of the wide-angle lens which is common in the market at present is large, the deformation and stretching of the image are obvious, the proportion is not coordinated, and the distortion needs to be corrected by means of a later software algorithm, so that the problem to be solved is urgent how to realize the balance of the large wide angle, the small distortion, the high pixels and the small volume of the optical lens.
Disclosure of Invention
Therefore, an object of the present invention is to provide an optical lens having at least the advantages of small distortion, ultra-wide angle, small volume and high pixels.
The embodiment of the invention realizes the aim through the following technical scheme.
The invention provides an optical lens, which consists of six lenses, and sequentially comprises the following components from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; a second lens with negative focal power, the object side of which is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface at a paraxial region; a sixth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; wherein the optical lens comprises at least one plastic lens and one glass lens; the optical lens satisfies the following conditional expression: 3.4< TTL/f <3.8, TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens.
Compared with the prior art, the optical lens provided by the invention adopts a six-piece glass-plastic mixed lens structure, and through specific focal power combination and surface type collocation, the lens has a compact structure, and has an ultra-large field angle, so that distortion of an edge field of view can be effectively reduced, the lens has a high image reduction degree in the whole field of view, and the requirements of ultra-wide angle, small distortion and high pixels can be better met; meanwhile, the lens has better thermal stability, high-definition imaging of the lens in high-low temperature environments can be realized, and applicability of the lens in different application occasions is improved.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention.
Fig. 2 is an F-Theta distortion graph of an optical lens according to a first embodiment of the present invention.
Fig. 3 is a graph showing a field curvature of an optical lens according to a first embodiment of the present invention.
Fig. 4 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention.
Fig. 6 is an F-Theta distortion graph of an optical lens according to a second embodiment of the present invention.
Fig. 7 is a field curvature chart of an optical lens according to a second embodiment of the present invention.
Fig. 8 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention.
Fig. 9 is a schematic structural diagram of an optical lens according to a third embodiment of the present invention.
Fig. 10 is an F-Theta distortion graph of an optical lens according to a third embodiment of the present invention.
Fig. 11 is a field curve diagram of an optical lens according to a third embodiment of the present invention.
Fig. 12 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
In this context, near the optical axis means the area near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region.
The invention provides an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the optical lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and an optical filter.
The first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface.
The second lens has negative focal power, and the object side surface of the second lens is concave.
The third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface.
The fourth lens element has positive refractive power, wherein an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is convex.
The fifth lens element has negative refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex at a paraxial region.
The sixth lens element has positive refractive power, wherein an object-side surface thereof is convex at a paraxial region and an image-side surface thereof is concave at the paraxial region.
In some embodiments, a diaphragm for limiting the light beam may be disposed between the third lens and the fourth lens, and the diaphragm is disposed on the object side surface of the fourth lens, so that not only can the generation of ghost images of the optical lens be reduced, but also the range of the emergent light at the front end of the optical lens can be converged, and the caliber of the rear end of the optical lens can be reduced.
In some embodiments, the optical lens comprises at least one glass lens and one plastic lens, and adopts a glass-plastic mixed lens structure, so that the volume and weight of the lens are effectively reduced, the resolution of the whole lens is improved, the distortion and aberration correction difficulty is reduced, the view angle and the image quality are effectively balanced, and the imaging stability of the lens in a high-low temperature environment is ensured.
In some embodiments, the optical lens satisfies the conditional expression: 3.4< TTL/f <3.8, wherein TTL represents the total optical length of the optical lens and f represents the effective focal length of the optical lens. The total length of the lens can be effectively limited by meeting the above conditions, and miniaturization of the optical lens can be better realized.
In some embodiments, the optical lens satisfies the conditional expression: 0.7< BFL/f <0.9, where f represents an effective focal length of the optical lens and BFL represents an optical back focus of the optical lens. The lens has longer optical back focus, and the interference between the lens and the chip caused by insufficient back focus can be avoided, thereby influencing the imaging quality of the whole lens.
In some embodiments, the optical lens satisfies the conditional expression: -2< f1/f < -1,4< R11/R12<10, wherein f1 represents an effective focal length of the first lens, f represents an effective focal length of the optical lens, R11 represents a radius of curvature of an object side of the first lens, and R12 represents a radius of curvature of an image side of the first lens. The first lens has proper negative focal power, light rays in a larger range can enter the optical system, the ultra-wide angle characteristic of the lens is realized, the optical lens can acquire more scene information, the requirement of large-range shooting is met, and meanwhile, the small distortion of the lens is realized.
In some embodiments, the optical lens satisfies the conditional expression: -2< f2/f < -1, wherein f2 represents an effective focal length of the second lens and f represents an effective focal length of the optical lens. The second lens has proper negative focal power, so that light can enter the system more smoothly, the difficulty of aberration correction is reduced, and the resolving power of the optical lens is improved.
In some embodiments, the optical lens satisfies the conditional expression: 0.8< f3/f <1.5, -0.8< R31/R32< -0.3, wherein f3 represents an effective focal length of the third lens, f represents an effective focal length of the optical lens, R31 represents a radius of curvature of an object side of the third lens, and R32 represents a radius of curvature of an image side of the third lens. The positive focal power and the surface shape of the third lens are reasonably set, so that aberration caused by the front lens can be corrected, f-Theta distortion is reduced, spatial angular resolution is improved, and distortion degree of an edge image is reduced.
In some embodiments, the optical lens satisfies the conditional expression: 0.6< f4/f <1.2, -2< R41/R42< -1, wherein f4 represents an effective focal length of the fourth lens, f represents an effective focal length of the optical lens, R41 represents a radius of curvature of an object side surface of the fourth lens, and R42 represents a radius of curvature of an image side surface of the fourth lens. The fourth lens has proper positive focal power and surface shape, which is beneficial to converging light, and the divergent light entering the system from the front smoothly enters the rear optical system, so that the trend of the whole light path is more gentle, the distortion correction difficulty is reduced, and the whole imaging quality is improved.
In some embodiments, the optical lens satisfies the conditional expression: -1.5< f5/f < -1,0.5< R51/R52<1, wherein f5 represents an effective focal length of the fifth lens, f represents an effective focal length of the optical lens, R51 represents a radius of curvature of an object side surface of the fifth lens, and R52 represents a radius of curvature of an image side surface of the fifth lens. The focal length and the surface shape of the fifth lens are adjusted to reduce the shape change of the fifth lens, so that the aberration caused by the front lens group can be better corrected, the high-grade spherical aberration and the coma are improved, and the high resolution and the uniform overall resolution are realized.
In some embodiments, the optical lens satisfies the conditional expression: 0.5< R61/R62<1.2,0.3< f/R62<1, wherein f represents an effective focal length of the optical lens, R61 represents a radius of curvature of an object side surface of the sixth lens, and R62 represents a radius of curvature of an image side surface of the sixth lens. The above conditions are met, the surface type of the sixth lens is reasonably arranged, the sixth lens can be better matched with the front five lenses, the aberration of the system is better corrected, the correction of the aberration is very beneficial, and the imaging quality of the lens is improved.
In some embodiments, the optical lens satisfies the conditional expression: 2.2< IH/f <3, wherein f represents the effective focal length of the optical lens, and IH represents the image height corresponding to the full field angle of the optical lens. The requirements of large-scale detection and high-quality imaging can be balanced, and the adaptability of the optical lens is improved.
In some embodiments, the optical lens satisfies the conditional expression: 0.4< (YR61+YR62)/IH <0.7, wherein YR61 represents the vertical distance between the object-side surface inflection point of the sixth lens and the optical axis, YR62 represents the vertical distance between the image-side surface inflection point of the sixth lens and the optical axis, and IH represents the image height corresponding to the full field angle of the optical lens. The positions of the inflection points arranged on the object side surface and the image side surface of the sixth lens can be reasonably set up to strengthen coma correction of an off-axis field and well converge field curvature, control aberration and improve imaging quality of the lens.
In some embodiments, the optical lens satisfies the conditional expression: 0.7< (f3+f4+f5)/f <0.8, wherein f3 represents an effective focal length of the third lens, f4 represents an effective focal length of the fourth lens, f5 represents an effective focal length of the fifth lens, and f represents an effective focal length of the optical lens. The lens has the advantages that the sum of focal lengths of the front lens and the rear lens of the diaphragm is reasonably configured, so that the coma correction of the off-axis visual field is enhanced, and meanwhile, the curvature and the aberration are well converged, so that the lens has higher resolving power.
In some embodiments, the optical lens satisfies the conditional expression: -15<f A /f B <6, wherein f A Representing a combined focal length of the first, second and third lenses, f B Representing a combined focal length of the fourth lens, the fifth lens, and the sixth lens. The lens group and the lens group are arranged in a front lens group and a rear lens group, and the front lens group and the rear lens group are arranged in the front lens group.
In some embodiments, the optical lens satisfies the conditional expression: 0.025mm/° < IH/FOV <0.03mm/°, wherein FOV represents the maximum field angle of the optical lens and IH represents the image height corresponding to the full field angle of the optical lens. The lens has a larger angle of view and smaller distortion, and can better meet the requirements of wide field of view, small distortion and high pixels.
In some embodiments, the optical lens satisfies the conditional expression: 2.4< f/EPD <2.6, wherein f represents an effective focal length of the optical lens and EPD represents an entrance pupil diameter of the optical lens. The imaging device meets the conditions, and can reduce noise influence caused by too weak light when the optical lens images in a dark environment by reasonably controlling the ratio of the effective focal length to the entrance pupil diameter of the optical lens, so that the imaging quality is improved, and the optical lens can meet imaging requirements under different luminous fluxes.
In some embodiments, the optical lens satisfies the conditional expression: -1< SAG21/CT2< -0.7, wherein SAG21 represents the object side edge sagittal height of the second lens and CT2 represents the center thickness of the second lens. The ratio of the sagittal height to the thickness of the second lens can be properly adjusted to be beneficial to lens manufacturing and molding, thereby improving the manufacturing yield and shortening the total length of the optical lens.
In some embodiments, the optical lens satisfies the conditional expression: 0.17< (CT4+CT5)/TTL <0.22,2.6< CT4/CT5<3.8, wherein CT4 represents the center thickness of the fourth lens, CT5 represents the center thickness of the fifth lens, and TTL represents the total optical length of the optical lens. The above conditions are met, and the center thicknesses of the fourth lens and the fifth lens are reasonably set, so that uneven filling of plastic resin materials during molding of the lens due to over-thin fifth lens can be avoided, or interference of the lens in the assembling process due to over-thick fourth lens can be avoided, and imaging effect is influenced.
In some embodiments, the optical lens satisfies the conditional expression: 0.9< ct3/DM3<1,1.1< DM2/DM3<1.3, wherein CT3 represents a center thickness of the third lens, DM2 represents an effective aperture of the second lens, and DM3 represents an effective aperture of the third lens. The surface shape of the third lens can be reasonably set to meet the above conditions, the turning trend of light can be effectively slowed down, the aberration and distortion of the off-axis visual field can be effectively corrected, and the high-quality imaging of the lens is ensured.
In some embodiments, the optical lens satisfies the conditional expression: -0.2< (1/f 2-1/f 1)/(1/f) <0.3, wherein f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, and f represents the effective focal length of the optical lens. The eccentric sensitivity of the second lens can be distributed to the first lens, and meanwhile, the first lens surface is gentle and the caliber is relatively small, so that the difficulty of production and processing is greatly reduced, and the manufacturing yield of the lens can be improved on the premise of high-quality imaging.
As an implementation mode, the matching structure of six glass-plastic mixed lenses is adopted, and the characteristics of large field angle, large aperture and long back focus are realized by reasonably restraining the surface and focal power of each lens so as to ensure that the structure is compact. The first lens and the third lens are made of glass spherical surfaces, and the geometric chromatic aberration of the optical system is effectively corrected through the low-dispersion characteristic of glass, so that the problem of temperature focus drift of the lens is effectively solved, and the resolving capability of the lens in a high-low temperature environment is ensured; the second lens, the fourth lens, the fifth lens and the sixth lens adopt plastic aspheric lenses, so that the cost can be effectively reduced, the aberration can be corrected, and an optical performance product with higher cost performance can be provided.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
In various embodiments of the present invention, when the lens in the optical lens is an aspherical lens, the aspherical surface profile of the lens satisfies the following equation:
；
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h in the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A 2i The aspherical surface profile coefficient of the 2 i-th order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S15 along an optical axis: a first lens L1, a second lens L2, a third lens L3, a stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave.
The second lens L2 has negative optical power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave.
The third lens L3 has positive optical power, and both the object side surface S5 and the image side surface S6 of the third lens are convex.
The fourth lens element L4 has positive refractive power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens element are convex.
The fifth lens element L5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex at a paraxial region.
The sixth lens element L6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is convex at a paraxial region thereof and an image-side surface S12 of the sixth lens element is concave at a paraxial region thereof.
The first lens L1 and the third lens L3 are glass spherical lenses, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses.
Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in table 1.
TABLE 1
In this embodiment, the aspherical parameters of each lens in the optical lens 100 are shown in table 2.
TABLE 2
Referring to fig. 2 to 4, an F-Theta distortion curve chart, a field curvature curve chart, and a vertical axis chromatic aberration curve chart of the optical lens 100 are shown, respectively.
The distortion curves of fig. 2 represent distortion at different image heights on the imaging plane, with the horizontal axis representing the percent distortion and the vertical axis representing the angle of view (in degrees). As can be seen from the figure, the F-Theta distortion at different image heights on the imaging plane is controlled within ±12%, indicating that the optical distortion of the optical lens 100 is well corrected.
The field curvature curve of fig. 3 shows the degree of curvature of the meridional image plane and the sagittal image plane, and the horizontal axis shows the amount of shift (in mm) and the vertical axis shows the angle of view (in degrees). As can be seen from the figure, the curvature of field of the meridional image plane and the sagittal image plane are controlled within ±0.1 mm, which indicates that the curvature of field of the optical lens 100 is well corrected.
The vertical axis color difference curve of fig. 4 shows the color difference between the longest wavelength and the shortest wavelength at different image heights on the imaging plane, in which the horizontal axis shows the vertical axis color difference value (unit: micrometers) of each wavelength with respect to the center wavelength, and the vertical axis shows the normalized field angle. As can be seen from the figure, the vertical chromatic aberration of each wavelength with respect to the center wavelength in different fields of view is controlled within ±2.5 microns, indicating that the vertical chromatic aberration of the optical lens 100 is well corrected.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention is shown, and the optical lens 200 according to the present embodiment is substantially the same as the first embodiment described above, and the difference is mainly that the radius of curvature, the aspheric coefficients and the thickness of each lens surface are different.
Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3 Table 3
In this embodiment, the aspherical parameters of each lens in the optical lens 200 are shown in table 4.
TABLE 4 Table 4
Referring to fig. 6 to 8, an F-Theta distortion curve chart, a field curvature curve chart, and a vertical axis chromatic aberration curve chart of the optical lens 200 according to the present embodiment are shown.
The distortion curves of fig. 6 show distortions at different image heights on the imaging plane, and as can be seen from the figure, the F-Theta distortion at different image heights on the imaging plane is controlled within ±10%, which indicates that the optical distortion of the optical lens 200 is well corrected.
The curvature of field curve of fig. 7 shows the degree of curvature of the meridional image plane and the sagittal image plane, and it can be seen from the figure that the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.12 mm, which indicates that the curvature of field of the optical lens 200 is well corrected.
The vertical chromatic aberration curve of fig. 8 shows chromatic aberration of the longest wavelength and the shortest wavelength at different image heights on the imaging plane, and it can be seen from the figure that vertical chromatic aberration of each wavelength with respect to the center wavelength in different fields of view is controlled within ±3.5 micrometers, which indicates that vertical chromatic aberration of the optical lens 200 is well corrected.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention is shown, and the optical lens 300 of the present embodiment is substantially the same as the first embodiment described above, and is mainly different in that an image side surface S4 of the second lens element is convex at a paraxial region, and curvature radius, aspheric coefficients, and thickness of each lens element are different.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
In this embodiment, the aspherical parameters of each lens in the optical lens 300 are shown in table 6.
TABLE 6
Referring to fig. 10 to 12, an F-Theta distortion curve chart, a field curvature curve chart, and a vertical axis chromatic aberration curve chart of the optical lens 300 according to the present embodiment are shown respectively.
The distortion curves of fig. 10 show distortions at different image heights on the imaging plane, and as can be seen from the figure, the F-Theta distortion at different image heights on the imaging plane is controlled within ±15%, which indicates that the optical distortion of the optical lens 300 is well corrected.
The curvature of field curve of fig. 11 shows the degree of curvature of the meridional image plane and the sagittal image plane, and it can be seen from the figure that the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.05 mm, which indicates that the curvature of field of the optical lens 300 is well corrected.
The vertical chromatic aberration curve of fig. 12 shows chromatic aberration of the longest wavelength and the shortest wavelength at different image heights on the imaging plane, and it can be seen from the figure that vertical chromatic aberration of each wavelength with respect to the center wavelength in different fields of view is controlled within ±2.5 micrometers, which indicates that vertical chromatic aberration of the optical lens 300 is well corrected.
Referring to table 7, the optical characteristics of the optical lens provided in the above four embodiments, including the effective focal length f, the field angle FOV, the total optical length TTL, the image height IH corresponding to the maximum field angle, and the correlation values corresponding to each of the above conditional expressions, are shown.
TABLE 7
Compared with the prior art, the glass-plastic mixed optical lens provided by the invention has at least the following advantages:
(1) The optical lens provided by the invention adopts six glass-plastic mixed lenses for matching, and through specific focal power combination and surface type matching, the lens not only has smaller total length and volume, but also has better thermal stability, and can realize high-definition imaging of the lens in high-low temperature environments.
(2) The optical lens provided by the invention has reasonable lens surface type and focal power arrangement, and the combination of the spherical lens and the aspherical lens enables the lens to have an oversized field angle, can shoot pictures in a larger range, simultaneously enables the lens to have smaller distortion, and can better meet the requirements of wide field of view, small distortion and high pixel.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (11)
1. An optical lens comprising six lenses, wherein the optical lens comprises, in order from an object side to an imaging surface along an optical axis:
the first lens with negative focal power has a convex object side surface and a concave image side surface;
a second lens with negative focal power, the object side of which is a concave surface;
the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface at a paraxial region;
a sixth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
wherein the optical lens comprises at least one plastic lens and one glass lens;
the optical lens satisfies the following conditional expression: 3.4< TTL/f <3.8, wherein TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens;
the optical lens satisfies the following conditional expression: 0.025mm/° < IH/FOV <0.03mm/°, wherein FOV represents the maximum field angle of the optical lens and IH represents the image height corresponding to the full field angle of the optical lens.
2. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.7< BFL/f <0.9, wherein BFL represents an optical back focus of the optical lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -2< f1/f < -1,4< R11/R12<10, wherein f1 represents an effective focal length of the first lens, R11 represents a radius of curvature of an object side of the first lens, and R12 represents a radius of curvature of an image side of the first lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -2< f2/f < -1, wherein f2 represents the effective focal length of the second lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.8< f3/f <1.5, -0.8< R31/R32< -0.3, wherein f3 represents an effective focal length of the third lens, R31 represents a radius of curvature of an object side of the third lens, and R32 represents a radius of curvature of an image side of the third lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.6< f4/f <1.2, -2< R41/R42< -1, wherein f4 represents an effective focal length of the fourth lens, R41 represents a radius of curvature of an object side surface of the fourth lens, and R42 represents a radius of curvature of an image side surface of the fourth lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -1.5< f5/f < -1,0.5< R51/R52<1, wherein f5 represents an effective focal length of the fifth lens, R51 represents a radius of curvature of an object side of the fifth lens, and R52 represents a radius of curvature of an image side of the fifth lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.5< R61/R62<1.2,0.3< f/R62<1, wherein R61 represents a radius of curvature of an object side surface of the sixth lens, and R62 represents a radius of curvature of an image side surface of the sixth lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 2.2< IH/f <3, wherein IH represents the image height corresponding to the full field angle of the optical lens.
10. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.4< (YR61+YR62)/IH <0.7, wherein YR61 represents the vertical distance between the object-side surface inflection point of the sixth lens and the optical axis, YR62 represents the vertical distance between the image-side surface inflection point of the sixth lens and the optical axis, and IH represents the image height corresponding to the full field angle of the optical lens.
11. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.7< (f3+f4+f5)/f <0.8, wherein f3 represents an effective focal length of the third lens, f4 represents an effective focal length of the fourth lens, and f5 represents an effective focal length of the fifth lens.
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| JP2020046565A (en) * | 2018-09-20 | 2020-03-26 | マクセル株式会社 | Image capturing lens system and image capturing device |
| CN112147754A (en) * | 2019-06-28 | 2020-12-29 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN113900235A (en) * | 2021-10-20 | 2022-01-07 | 江西晶超光学有限公司 | Optical system, image capturing module, electronic equipment and carrier |
| CN115128779A (en) * | 2022-08-29 | 2022-09-30 | 江西联益光学有限公司 | Optical lens |
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| CN109725402A (en) * | 2017-10-27 | 2019-05-07 | 大立光电股份有限公司 | Optical imaging lens, image-taking device and electronic device |
| CN108681050A (en) * | 2018-06-19 | 2018-10-19 | 江西联创电子有限公司 | Vehicle-mounted pick-up camera lens |
| JP2020046565A (en) * | 2018-09-20 | 2020-03-26 | マクセル株式会社 | Image capturing lens system and image capturing device |
| CN112147754A (en) * | 2019-06-28 | 2020-12-29 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
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| CN115128779A (en) * | 2022-08-29 | 2022-09-30 | 江西联益光学有限公司 | Optical lens |
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